EP0817241B1 - Spulenvorrichtung für elektrodenlose Fluoreszenzlampe - Google Patents

Spulenvorrichtung für elektrodenlose Fluoreszenzlampe Download PDF

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Publication number
EP0817241B1
EP0817241B1 EP97304562A EP97304562A EP0817241B1 EP 0817241 B1 EP0817241 B1 EP 0817241B1 EP 97304562 A EP97304562 A EP 97304562A EP 97304562 A EP97304562 A EP 97304562A EP 0817241 B1 EP0817241 B1 EP 0817241B1
Authority
EP
European Patent Office
Prior art keywords
base
core
coil
vessel
lamp according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97304562A
Other languages
English (en)
French (fr)
Other versions
EP0817241A3 (de
EP0817241A2 (de
Inventor
Frederick Hetzel
Robert S. Mcfeely
David O. Wharmby
Steven Everest
Vito Joseph Arsena
Joseph C. Oberle
Mohomed Hanif Girach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of EP0817241A2 publication Critical patent/EP0817241A2/de
Publication of EP0817241A3 publication Critical patent/EP0817241A3/de
Application granted granted Critical
Publication of EP0817241B1 publication Critical patent/EP0817241B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/048—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using an excitation coil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
    • H01J5/58—Means for fastening the separate part to the vessel, e.g. by cement
    • H01J5/60—Means for fastening the separate part to the vessel, e.g. by cement for fastening by mechanical means

Definitions

  • This invention relates to an electrodeless fluorescent lamp, and is particularly concerned with the support of a coil assembly of such a lamp.
  • An electrodeless fluorescent lamp is known for example from EP-A-0 660 375.
  • the lamp comprises a sealed discharge vessel containing a fill which when energized sustains a discharge.
  • the vessel is coated with, amongst other things, a layer of phosphor which converts the UV radiation of the discharge to visible light.
  • the vessel has re-entrant portion containing a coil of a coil assembly which produces a radio frequency (RF) Solenoidal field in the vessel.
  • the coil is energized by an RF oscillator.
  • the RF oscillator is housed in a housing which supports the coil assembly, the oscillator, and the discharge vessel.
  • the coil assembly comprises a base member which is supported by the housing.
  • the coil of the assembly comprises a core and a winding on the core.
  • the core is a hollow circular cylinder of ferrite.
  • the winding is wound directly on the core.
  • the core and winding is fixed to the base member using a suitable adhesive.
  • the winding is connected to connecting pins on the base member. The connecting pins provide connection to the oscillator.
  • an electrodeless fluorescent lamp comprising: a discharge vessel containing a fill which when energised sustains a discharge and at least a phosphor coating on the inner surface of the vessel, the vessel having a re-entrant portion; and a coil assembly comprising:- a base, a core of magnetically permeable material supported in the base, a coil around the core, the coil and core of the coil assembly being housed in the re-entrant portion of the vessel; and means for retaining the core on the base, characterized in that the retaining means includes a clip arrangement engaging the core.
  • the core is hollow, and the clip of the retaining means comprises at least a pair of fingers extending through the centre of the core. each finger having a lateral projection which engages the end of the core remote from the base.
  • the core is pushed onto the fingers which act as the clip to retain it, simplifying the assembly operation.
  • the retaining means comprises at least a pair of fingers between which the core is located, each finger having a lateral projection engaging the end of the core remote from the base.
  • the core is pushed between the fingers which act as the clip to retain it simplifying the assembly operation.
  • the retaining means is a coil former around the core, and the core is held in the coil former by the said clip which may be a circlip within the coil former, or a plurity of fingers having lateral projections engaging the core.
  • the fluorescent lamp of the invention preferably comprises a housing supporting the base of the coil assembly, and the discharge vessel.
  • the housing may house means for energising the coil with an RF signal.
  • a further aspect of the invention provides an electrodeless fluorescent lamp comprising a coil assembly having a base;
  • the split ring is supported by the base of the coil assembly, the base being split, the base and thus the ring also being compressed by the housing.
  • the base is supported in the split ring, the ring being compressed by the housing to clamp the base and the vessel in the ring.
  • the fluorescent lamp comprises a sealed discharge vessel 1 containing a known fill (not shown) including mercury vapour capable of sustaining a discharge when suitably energized.
  • the discharge produces UV light which is converted to visible light by a phosphor coating 2 on the inner surface of the vessel.
  • the vessel may have other coatings as known in the art.
  • the other coatings include an electrically conductive, transparent layer (not shown).
  • the vessel has a re-entrant portion 3 and an exhaust tube 4 extending along the axis of the re-entrant portion.
  • the exhaust tube contains mercury amalgam 5.
  • the discharge is energized by an RF field produced by a coil 6 in the re-entrant portion 3.
  • the coil 6 is energized by a circuit 78 comprising an RF oscillator 7 and a rectifier 8.
  • the coil 6 is part of a coil assembly which will be described hereinbelow.
  • the coil assembly, discharge vessel and energising circuit 78 are supported by a housing 9 to which a lamp cap 10 such as a bayonet cap or screwcap is connected.
  • Figure 2 shows an illustrative coil assembly.
  • the assembly comprises a hollow circular cylindrical ferrite core 20 around which a coil 21 is wound.
  • the coil 21 may be wound directly on the core 20.
  • the assembly comprises a base 22 which in this example supports the discharge vessel 1.
  • a base 22 which in this example supports the discharge vessel 1.
  • the lower lip 11 of the vessel 1 rests on the base 22.
  • the vessel 1 may be fixed to the base in any suitable manner.
  • the core 20 is a hollow circular cylinder through which the exhaust tube 4 extends. Integral with the base 22 and upstanding therefrom is at least a pair of fingers 23 which extend through the centre of the core. The fingers have, at their ends, remote from the base, lateral projections 24 which engage the core and retain it on the base.
  • the fingers are resilient. To assemble the core to the support, the core is pushed over the fingers until the projections engage its surface remote from the base. Thus, the fingers act as a clip.
  • a spring washer 25 may be provided between the core and the base 22, to prevent the core rattling on the support.
  • the coil 21 is soldered or connected by other means such as crimping to pins 26 which connect the coil to the energising circuit 78.
  • the projections 24 are replaced by a circlip (not shown).
  • the fingers may be replaced by a tube.
  • another coil assembly comprises a hollow circular cylindrical ferrite core 30 and a coil 31.
  • the exhaust tube 4 of the discharge vessel extends through the centre of the core 30.
  • the assembly comprises a base 32 which may support the discharge vessel in the same way as base 22 of the support of Figure 2.
  • a coil former 34 Integral with the base 32 and upstanding from it is a coil former 34.
  • the coil 31 is wound on the former 34.
  • the core is retained within the coil former by a circlip 33 which is held in a groove in the inner circumference of the coil former.
  • the circlip 33 could be replaced by inwardly directed projections similar to projections 24 of Figure 2.
  • the coil 31 is soldered or connected by other means such as crimping to pins 26 which connect the coil to the energising circuit 78.
  • a spring washer similar to washer 25 of Figure 2 may be provided to prevent the core rattling.
  • Figures 4A to 4C show a coil support of the currently preferred embodiment of the invention.
  • the coil support is a single-piece plastic moulding comprising a circular base 42 integral with a cylindrical coil former and core retainer 40 upstanding from the base.
  • the cylindrical former and retainer 40 in use, houses a hollow circular cylindrical ferrite core (not shown for clarity).
  • the former and retainer 40 is defined by core retaining fingers 43 interleaved with coil forming fingers 45.
  • the core is axially retained within the retainer 40 by flanges 46-in the end of the retainer 40 near the base 42 and by lateral projections 44 at the ends of the core retaining fingers 43 remote from the base 42.
  • the projections 44 engage the end of the core remote from the flanges 46.
  • the coil forming fingers 45 have winding guides moulded thereon.
  • the fingers 43 and 45 are resilient.
  • the ferrite core is pushed into former and retainer 40 and retained axially between the flanges 46 and the projections 44.
  • a coil is then wound on the coil forming fingers.
  • the fingers 43 and 45 are pressed by the winding of the coil onto the core whereby the wound coil also retains the core.
  • the base 42 has pairs 47 of walls defining slots for holding the edge of a circuit board of the energising circuit 78.
  • the board is offset from the centre of the base 42 to avoid contacting the end of the exhaust tube 4.
  • Apertures 48 are provided in the base 42 adjacent the slots for connecting pins to which the coil is soldered, or connected by other means such as crimping, and which connect the coil to the circuit board 78.
  • a slot 49 is provided in the edge of the base 42 to engage a projection in the housing 9 to prevent rotation of the coil assembly relative to the housing and to allow the coil assembly to fit with the housing in only one orientation.
  • Figure 5B is a partial sectional view of the housing 9, the circuit board 78 and the base 42 of the coil assembly, and the discharge vessel 1.
  • the housing 9 has an internal cylindrical flange 50 which supports the base 42.
  • the base is retained on the flange by wedges 51.
  • the flange 50 and wedges 51 are moulded integrally with the housing 9.
  • a projection 52 ( Figure 5A) of the flange 50 engages the anti-rotation slot 49 ( Figure 4B) in the edge of the base 42.
  • the base 42 is simply pushed over the wedges 51 until it snaps into position between the flange 50 and the wedges 51.
  • the discharge vessel 1 may be directly supported by the base of the coil assembly as shown in Figure 1.
  • the vessel 1 may be supported directly by the housing 9.
  • the circuit board 78 of Figure 5 may have sockets which receive the connecting pins 26 or 36.
  • Figure 6 illustrates two modifications of the arrangement of Figure 5B.
  • the flange 50 and wedges of Figure 5B are replaced by a ratchet 60 integrally moulded with the housing 9.
  • the discharge vessel is retained by a split ring 61 (also shown in Figure 7) fixed to the base 42 of the coil assembly by detents 62 which project through corresponding slots in the base 42 and clip it to the base.
  • the lower lip 11 of the discharge vessel is formed with a radially ourward projection in the form of a bulge 64.
  • the split ring 61 has a channel 63 which engages the bulge over an arc of approximately 180° around the vessel.
  • the split ring 61 which has an opening 65 for receiving the vessel, is pushed on to the bulge 64.
  • the vessel and split ring are then placed over the coil support, and the detents 62 pushed into the slots in the base 42 of the coil support.
  • the base 42 is split along a radius 66. As the base is forced along the ratchet, the split, and thus the clip also, is compressed clamping the vessel in the clip.
  • the coil assembly 6 has a base 42 which is supported by a resilient split ring 80.
  • the outer circumference of the ring 80 engages the ratchet 60 on the housing.
  • the base 42 is held in a groove in the inner circumference of the ring 80.
  • the bulge 64 at the base of the vessel is engaged by a channel 83 above the base 42 in the ring 80.
  • the circuit 78 is fixed to the base 42 by the slots 47. Further slots 81 are provided in the housing to prevent rotation of the board in the housing 9.
  • the lamp may be made and sold separately from the energising circuitry comprising the energising circuit 7, 8 comprising the oscillator 7 and rectifier 8.
  • the energising circuit 7, 8 may be housed separately from the discharge vessel and coil assembly.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (15)

  1. Elektrodenlose Leuchtstofflampe enthaltend:
    einen Entladungsbehälter (1), der eine Füllung, die, wenn sie angeregt wird, eine Entladung aufrecht erhält, und wenigstens einen Leuchtstoffüberzug (2) auf der inneren Oberfläche auf dem Behälter enthält, wobei der Behälter einen zurückspringenden Abschnitt (3) aufweist; und
    eine Spulenvorrichtung enthaltend:
    einen Sockel (22, 32, 42), einen Kern (20, 30) aus magnetisch permeablem Material, der auf dem Sockel gehaltert ist, eine Spule (6, 21, 31), die um den Kern herum angeordnet ist, wobei die Spule und der Kern der Spulenvorrichtung in dem zurückspringenden Abschnitt der Behälters untergebracht sind, und
    eine Vorrichtung ( 22, 23, 33, 34, 43, 44) zum Haltern des Kerns auf dem Sockel, dadurch gekennzeichnet, daß die Halterungsvorrichtung eine Klemmanordnung aufweist, die an dem Kern angreift.
  2. Lampe nach Anspruch 1, wobei die Halterungsvorrichtung einstückig mit dem Sockel ist.
  3. Lampe nach Anspruch 1 oder 2, wobei die Halterungsvorrichtung wenigstens zwei Finger (43) aufweist, zwischen denen der Kern angeordnet ist, wobei die Finger entsprechende seitliche Vorsprünge (44) haben, die an dem vom Sockel entfernten Ende des Kerns angreifen.
  4. Lampe nach Anspruch 1 oder 2, wobei der Kern hohl ist und die Halterungsvorrichtung wenigstens zwei Finger (23) aufweist, die sich durch den Kern erstrecken, wobei die Finger entsprechende seitliche Vorsprünge (24) haben, die an dem vom Sockel entfernten Ende des Kerns angreifen.
  5. Lampe nach Anspruch 1, 2 oder 4, wobei die Spule direkt auf den Kern gewickelt ist.
  6. Lampe nach Anspruch 1 oder 2, wobei die Halterungsvorrichtung auch ein Spulenformer (34) ist, in dem der Kern angeordnet ist, die Spule auf den Spulenformer gewickelt ist und der Kern in dem Former durch einen Sprengring (33) in dem Former gehalten ist.
  7. Lampe nach einem der vorstehenden Ansprüche, wobei ferner ein Gehäuse (9) vorgesehen ist, das die Spulenvorrichtung und den Entladungsbehälter haltert.
  8. Lampe nach einem der vorstehenden Ansprüche, wobei der Behälter direkt durch den Sockel der Spulenvorrichtung gehaltert ist.
  9. Lampe nach einem der vorstehenden Ansprüche, wobei der Sockel des Behälters einen radial äusseren Vorsprung (64) hat, der in einen Kanal (63) eingreift, der sich um den Sockel des Behälters herum erstreckt, wobei der Kanal in einer Klemme (61) gebildet ist, die an dem Sockel der Spulenvorrichtung befestigt ist.
  10. Lampe nach Anspruch 7, wobei ein Spaltring (80) vorgesehen ist, der sich um den Sockel des Behälters und um den Sokkel der Spulenvorrichtung herum erstreckt, wobei der Spaltring durch das Einsetzen in das Gehäuse zusammengedrückt wird, um den Sockel der Spulenvorrichtung und den Sockel des Behälters festzuklemmen.
  11. Lampe nach Anspruch 1, wobei die Halteklemmanordnung auch ein Spulenformer ist und einen ersten Satz von Fingern (43) mit seitlichen Vorsprüngen (44), die an dem Ende des Kerns angreifen, und weitere Finger (45) aufweist, auf denen sich Wicklungsführungen befinden.
  12. Lampe nach Anspruch 1, wobei ferner ein Schaltkartenhalter (47) auf der von dem Kern und der Spule entfernten Seite des Sockels vorgesehen ist.
  13. Lampe nach Anspruch 1, wobei ferner Schaltungsverbindungsstifte (26, 36) vorgesehen sind, mit denen die Spule verbunden ist, wobei die Stifte durch den Sockel getragen sind.
  14. Lampe nach Anspruch 1, wobei ferner Mittel (78) zum Speisen der Spule mit einem HF Signal vorgesehen sind.
  15. Lampe nach Anspruch 1, wobei die Klemmanordnung an der Basis durch Rastnasen (62) befestigt ist.
EP97304562A 1996-06-26 1997-06-26 Spulenvorrichtung für elektrodenlose Fluoreszenzlampe Expired - Lifetime EP0817241B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9613359 1996-06-26
GB9613359A GB2314689A (en) 1996-06-26 1996-06-26 Coil assembly

Publications (3)

Publication Number Publication Date
EP0817241A2 EP0817241A2 (de) 1998-01-07
EP0817241A3 EP0817241A3 (de) 1998-03-11
EP0817241B1 true EP0817241B1 (de) 2002-11-27

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EP97304562A Expired - Lifetime EP0817241B1 (de) 1996-06-26 1997-06-26 Spulenvorrichtung für elektrodenlose Fluoreszenzlampe

Country Status (6)

Country Link
US (1) US6084359A (de)
EP (1) EP0817241B1 (de)
JP (1) JP3950516B2 (de)
CN (1) CN1170232A (de)
DE (1) DE69717353T2 (de)
GB (1) GB2314689A (de)

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Also Published As

Publication number Publication date
GB9613359D0 (en) 1996-08-28
EP0817241A3 (de) 1998-03-11
JPH1092391A (ja) 1998-04-10
DE69717353T2 (de) 2003-09-04
JP3950516B2 (ja) 2007-08-01
DE69717353D1 (de) 2003-01-09
CN1170232A (zh) 1998-01-14
US6084359A (en) 2000-07-04
GB2314689A (en) 1998-01-07
EP0817241A2 (de) 1998-01-07

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